If you want to keep it organized but remove the pirate group tag ( -Vegamovies.To- ), just use the standard:
To strictly answer your request for a “proper piece” without the extraneous -Vegamovies.To-. prefix: -Vegamovies.To-.Vikings.Valhalla.S03E04.The.End...
Based on common scene naming conventions, a for that episode would be: If you want to keep it organized but
(you can adjust quality and codec as needed) depending on the actual file)
(or .mp4, depending on the actual file)